2024-03-29T02:32:03Z
https://jsciences.ut.ac.ir/?_action=export&rf=summon&issue=2556
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
INTRINSIC FLUORESCENT COMPOUNDS IN
ARMILLARIA MELLEA; HYPHAE AND
RHIZOMORPH
The organic solvent extraction of Armillaria mellea showed different highly
intrinsic fluorescent compounds either in rhizomorph or in hyphae (F , F , F ,
MF , MF and MF ). The characterization of ultraviolet and fluoro-spectrophotometry
of these compounds has been exhibited. Thin layer chromatography
and fluorescent spectrum of hyphae and rhizomorph indicated an additional
compound (FH) in hyphae. The compound probably plays a role in differentiation
from hyphae to rhizomorph
1993
12
01
https://jsciences.ut.ac.ir/article_31284_d2337972d450293632a582e2fa834d76.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
SYNTHESIS AND THERMAL
REARRANGEMENT OF OXYGEN
HETEROCYCLIC SPIRANS
Thermal rearrangement of spirans (14) and (31) yields the xanthones (16,34)
and diphenylrnethane (15, 32), respectively. The structure for xanthone (16),
isolated from thermolysis, has been established by reduction to xanthene (20)
followed by reoxidation to give xanthone (16). Alternatively, methylation of the
diphenylmethane (15) followed by heating with selenium dioxide also yields
xanthone (16). The transformation of the diphenylrnethane (15) into xanthone
(16) occurs by heating with selenium dioxide either with or without solvent.
1993
12
01
https://jsciences.ut.ac.ir/article_31285_cf723caa0278f6f64bb9d7bafbe86836.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
SYNTHESIS AND PHARMACOLOGICAL
EVALUATION OF N-METHYL PIPERIDINE
ANALGESICS
Pain is probably the immediate stimulus for more visits to the Physician's
office than all other complaints combined. Since pain serves as an alert to
injury, it is often the first harbinger of disease. Piperidine has been extensively
utilized for the synthesis of a wide range of therapeutic agents in
general and analgetics in particular for the mitigation of pain. In a similar
attempt, the N-methyl piperidine molecule was derivatized with various
phenacyl halides and the resultant quaternary derivatives were explored extensively
for analgesic activity using the tail flick test. Spectrophotometric
techniques such as UV, IR, Proton NMR and Mass (EI) were also utilized to
confirm the structures of the newly-synthesized compounds. All the compounds
exhibited analgesic activity and particularly 1-[3', 4'-dihydroxyphenacyl)
- N - methylpiperidinium bromide showed approximately one twentieth
the analgesic activity of morphine
1993
12
01
https://jsciences.ut.ac.ir/article_31286_ce5d2fd699eb8ce4200a7c9750977ae0.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
SYNTHESIS OF 2-PROPYLANTHRALIN AND
2,7-DIPROPY LANTHRALIN VIA REDUCTIVE
CLAISEN REARRANGEMENT OF
ALLYLOXYANTHRAQUINONES
Reductive Claisen rearrangement of 1-allyloxy-8-methoxy-9, 10-anthraquinone
followed by demethylation and reduction, and of 1,8-bisallyloxy-9,lO-anthraquinone followed by reduction provides regiospecific syntheses of 2-propyl- and 2,7-dipropyl anthralin
1993
12
01
https://jsciences.ut.ac.ir/article_31287_02bbe1bf5896f619a1a8eaa56e0342cf.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
POSITIVE AND NEGATIVE ION MASS
SPECTRA OF RING - SUBSTITUTED
NITROBENZENES
The 70 ev positive and negative ion mass spectra of ring-substituted nitrobenzenes
were studied. The influence of the substituent group on the fragmentation
modes of the molecular ions is discussed. The effect of pressure in the
formation of negative ions was also studied. As expected, the ratio of fragment
ions to negative molecular ions decreased with increasing pressure in ion
source.
1993
12
01
https://jsciences.ut.ac.ir/article_31288_2ceabd5b89d8d2439b977cbebc90a2f7.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
A KINETIC STUDY OF THE DECOMPOSITION
OF PYRIDINE CHROMIUM (VI) PEROXIDE WITH
ALCOHOLS
A kinetic study of the decomposition of pyridine chromium peroxide with
methanol, ethanol, propanol and isopropanol has been made over the temperature
range 25 to 40°C. It is found that the ligand exchange stage is the rate determining step in the oxidation process. The activation parameters E , ?H‡ and ?S‡ for the reactions are determined. It is believed that the peroxide linkage is primarily responseble for the oxidation process
1993
12
01
https://jsciences.ut.ac.ir/article_31289_2e0ea926242511bfd3474000af64934b.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
HYDROCHEMISTRY OF KARST SPRINGS FROM
TWO CARBONATIC UNITS IN ZAGROSIDES OF
IRAN
One hundred and nineteen karst springs, all with electrical conductivity of less than
500 gmhosfcm, discharging two carbonatic aquifers in Zagrosides of Iran are chosen
and studied. The results indicate that the lithology of each unit is well reflected in the
chemistry of the springs and the overall mineralogical composition of the aquifer can
successfully be reconstructed from the hydrochemistry of the springs using a mass
balance approach. A comparison of the chemistry of the springs reveals that the
significant difference is due to the dolomitic nature of one of the studied aquifers
1993
12
01
https://jsciences.ut.ac.ir/article_31290_fe19989a3bd7c0e2a35637aad3be91ab.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
AN EXTENDED NOTION OF THE GRADE OF
AN IDEAL, AND GORENSTEIN RINGS
In this paper we shall apply modules of generalized fractions to extend the
notion of the grade of an ideal, and to obtain characterizations of Gorenstein
rings.
1993
12
01
https://jsciences.ut.ac.ir/article_31291_41a322f2e53af1c74c3f71807a2af6f5.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
TWO PHOTON TRANSITIONS IN THE
OPTOGALVANIC SPECTRUM OF NEON
Seventeen two-photon transitions for neon have been observed in the 580-
635 nm spectral region for use in the spectroscopic study of its higher excited
levels, which are not accessible by one-photon absorption. To compare the two
and one-photon absorption signals originating from the same lower level, an
effort was made to record single-photon optogalvanic spectrum in the available
wavelength region. The dependence of optogalvanic signals on the laser power
has also been studied. The optogalvanic signals were obtained from a commercial
neon-filled, hollow-cathode lamp, which was irradiated with pulsed dye
laser pumped with N laser
1993
12
01
https://jsciences.ut.ac.ir/article_31292_d648ae0e53dd323b348c3b52539f6d9b.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
INTERACTION OF PROTEINS WITH SMALL MOLECULES
1993
12
01
https://jsciences.ut.ac.ir/article_31293_17dbeedc9593d059e709297cd2dfaf4b.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
[6 + 2] AND [4 + 2] CYCLOADDITION
REACTION OF DIPHENYLKETENE AND
CYCLOHEPTATRIENE
The cycloaddition reaction of diphenylketene and cycloheptatriene is studied.
The reaction proceeds via a highly asynchronous reaction path to the zwitterionic
6 as intermediate. Subsequent CC- bond formation yields 8, 8 diphenylbicyclo [4. 2. I] nona-2, 4-dien-7-one (1) and 7,7-diphenylbicycol [3.2.2] nona-2, 8-dien-ri-one (2) in a 1:1 ratio as formal [6+2] and [4+2] cycloaddition products
1993
12
01
https://jsciences.ut.ac.ir/article_31294_6274d8ad2ef7bf0d824195161b98a9d4.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
STUDIES IN CARBOTRICATIONS:
PREPARATION AND CARBON-13 NUCLEAR
MAGNETIC RESONANCE SPECTROSCOPIC
STUDY OF 3,7,9-TRIHYDRO TETRACYCLO
[3.3.1. 0 . 0 ] NONANE-3,7,9 TRIYLTRICATION:
A TRIPROTONATED
TETRACYCLO-[3.3.1.0 . 0 ]
NONANE-3,7,9-TRIONE AND ATTEMPTED
PREPARATION OF
RELATED TRICATIONS
Synthetic approaches have been described for the preparation of precursors to triasterane trications and related carboxenium ions. The investigation on carbocationic
intermediates from treatment of these precursors with FSO H/SbF /SO CIF system has led to the preparation and 13C-NMR spectroscopic characterization of the isomeric 3,7,9-tri-hydrote-tracyclo [3. 3.1. 0 . 0 ] nonane-3,7,9-triyltrications.
1993
12
01
https://jsciences.ut.ac.ir/article_31295_51bd8fe9bbcb11a99cc9575eef3fc2cc.pdf
Journal of Sciences, Islamic Republic of Iran
J.Sci.I.R.I
1016-1104
1016-1104
1993
4
4
PREPARATION AND MOLECULAR STRUCTURE
OF BIS (TETRAMETHYLETHYLENEDIAMINE)
COPPER(I) DICHLORO CUPRATE(I) ,
[Cu (TMEDA) ] [CuC1 ]
A complex of N, N, N', N', -tetramethylated ethylenediamine, TMEDA, with CuCI is prepared. The crystal and molecular structure of this complex is characterized
by a single-crystal X-ray diffraction study. The complex is found to contain [Cu
(TMEDA) ] cation which is nearly tetrahedral and the [CuCI ) anion is linear which
Cu lies on a center of symmetry. Crystals are monoclinic space group P2 / n with four molecules/ unit cell of dimensions a = 9.240 (4), b = 14.930 (3), c = 14.288 (5) ? and
B= 97.02 (3)?. The final R value is 0.045 for 3808 reflections measured.
1993
12
01
https://jsciences.ut.ac.ir/article_31296_14d48a6cead1e47b33d5255bd2333d1c.pdf