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A wide range of concentration (1.0 x 104 to 6.0 x 10-2 g/rnl) of cellulose acetate in acetone is considered and dissymetry of all these concentrations is measured at different angles from 450 to 900 at intervals of SO degree. These dissymetries are measured by using two wave lengths ( 436 nm. and 546 nm. ) of incident light. An equation is derived for the dependence of dissymetry upon angle of measurement, considering the system as coil-like molecules. Making use of this equation and Zimm plot method, the radii of gyration of these solutions are measured. It is concluded that one gets the same results by both the methods. It is further concluded that the radius of gyration increases as the concentration decreases. read more
S NOOR ,M KALEEM ,N AHMAD ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 159
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N-imidotIyptamines may be converted to the corresponding p.carbolines is high yields by treatment with NaBH4-HCL.read more
N WAHEED ,A U RAHMAN ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 167
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The thermal copolymerization of styrene and acrylonitrile in the presence of inorganic salts like SJCl2, CdCl2, MnCl2 and NiCI2 Was invesdpted. The dereuing effects of thele salts on the rate was observed. The initiation reaction takes place thermally by the adsorption of the reacting monomers on the solid lUIface of inoIpDic: salts. The addition of salt doemot appreciably change the reactivity ratio values of the monomer. The lo'wering of molecular weight suggests that salts behave as a chain transfer agents.read more
A R KHAN ,S A K LODHI ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 173
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A comparative study of 4 substituted derivatives of symmetrical and ummetrical triazines as chromogenic reagents of the ferroin type has established 3-(2-pyridyl}-S, 64iphenyl-l,2,4-triazine (PDn, as a highly sensitive and selective reagent for divalent iron PleseDt in association with large amount of iron (1lI). The ease with which the lUghly colowed metal ions can be extracted into immilCible solvent to give stable solution, makes this reagent useful for the determination of traces of ln (U) present in a mixture L f lron(ll) and Iron(llI).read more
I ARAIN ,M H MEMON ,I H HASHMI ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 181
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The suitability of 3-(2-Pyridyl)-S,6-(diphenyl>-l,2,4-triazine (PDT) as a reagent for determination of iron (II) in presenoe of iron (III) is evaluated. The studies were made of the tris (pDT)-iron (II) complex formed in strong acid solution and its extraction in chloroform and also in l,l,l-trichloroethane. This serves as a useful method for the determination of microgram quantities of iron !II) in 'presenoe of iron (III).read more
M H MEMON ,I H HASHMI ,I ARAIN ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 187
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Tetrahydroxy-p-benzoquinone (I) has been reported to react with large number of metal ions and has been used in estimations as metal indicator of precipitant. However, due to its nonselective nature and various colour reactions over a wide range of pH, the use of (I) in analytical separation has not been investigated in past. The work reported here has been carried out to explore the possibility of use of (I) in quantitative analysis of metals by grmmetric,spectropbotornetric. titrimettic and atomic absorption methods. The experimental findings have also been employed in analysis of synthetic mixtures of cations so as to establish correltion of reactions between metals and reagent (D.read more
G H KAZI ,N A NAQVI ,M MAHMOOD ,Z H SHAH ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 193
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2-Aryl -dol -3-a1dehydes were condensed with aryloxyacetyl hydrazines under normal condition of 'azomethine' formation, to obtain twelve of the title compounds. The structures of these compounds have been confumed by elemental analysis and the I.R. spectra. The compounds are non-toxic, eNS depressants and hypothermic on albino mice.read more
S S TIWARI ,S MISRA ,R AGARWAL ,R K SATSANGI ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 199
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Twelve title compounds (IVa-I) were synthesised by two different methods. The iust method involved the reaction of 4-methyl-7-coumarin-oxyacetyl hydrazine (0 and corresponding, ethyl-2)-<Uoxo butyi'at -2-aryl hydrazones (11), while the second method involved the diazo-coupling of l-{4-methyl-coumarin-7yl)-oxyacetyl-3-methyl-pyrazolin-S-one (UI) with different substituted phenyl diazonium chlorides. The structures of 1-(4-methyl·-coumarin-7yl)-oxyacety1-3-methyl-4(substituted phenyl hydrazono/azo)-pyrazolin-S-ones (IVa-I) have been assigned on the basis of IR and PMR spectroscopy. The obtained data indicate that these compounds exist in hydrazone form instead of tautomeric keto-azo or enol-azo forms. The compounds are relatively non-toxic except one and are eNS stimulants.read more
R AGARWAL ,R K SATSANGI ,S S TIWARI ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 203
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Sixteen new quinazolinone derivatives have been synthesiled by the reaction of 2styryl-6, 8-disubstituted benzoxazjn.4-o~ with two different aromatic ambles (p-morpholino lIDiline and 2-aminopyridjne) or with two different hydruiclea (viz. iJonicotink: acid hydrazide and 2,4dinitrophenyl acetic acid hydrazide) in pyridine. The intermediate 2-styryl 6.lktiIubstituted benzo. xin-4-ones, were prepared by the reaction of cinnlmQyl chloride and 6.8-cliIUbstituted anthranlic acid in dry pyridine. Some of the synthesiled title compounds have been found to poaeIS lipificant anti-inflammatory activity against carrageenin-induced in1Iammation. An attempt hu also been made to establish a definite structure activity relationship. Further, in addition, the compounds were found to be mild central nervous system depreuaats and were quite non toxic. The structures of the unknown compounds were confirmed by elemental and spectral (LIt. cl P.M.L) analysis.read more
C SINGH ,V S MISRA ,R AGARWAL ,K C CHAUDHARY ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 209
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A number of 2-Hippyry1-3-aryl-quinazolinones were synthesDed by the co~densation of 2-Hippyryl-3, l(4H)-benzoxainone and various aromatic amines: No signitlcant antifertility activity in male mts was observed with any of them.read more
S S TIWARI ,R K SATSANGI ,A UPRETI ,
- 05 Jul 2011
- Volume Detail: VOLUME 3, NO4, DEC 1981
- Pages: 215
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