VOLUME 5, NO1, MAR 1983

Gravimetirc and Volumetric Estimation of Carmoquine Hydrochloride

In the present communication, we report the estimation of camoquine hydrochlorile using Reinecke salt (ammonium· tetraisothiocyanatodiunminechromate (III), and aniIinium. t~aiso· thiocyanatodianilinechromate (III) gravimetrically and volumetrically. read more

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S N KAPOOR ,M R SAXENA ,YDEY PAN ,P K MATHUR ,

Tritepene Sapogenins from Primula Denticulata Sm

Five triterpenoid sapogenins named as pridentigenin A, B, C, D and E have been iso­lated after acid hydrolysis of the saponins from Primula denticulata. Structures have been suggested for the sapogenins.read more

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W FUCH ,W VOELTER ,V U AHMAD ,Q N SAQIB ,K U GHANI ,

Determination of Barbit Acid Using Weisz - Ring Oven Technique

A method has been reported through which barbituric acid can be determined within the range from 0.50 to 10.00 J.lg with error of - 4.83 and - 2.90% in case of Segment Technique and Standard Scale methods respectively, using the Weisz Ring-oven method. Effect of interferences by sodium barbitone, guanidine carbonate urea and ethyl malonate have also been studied. The method is quite suited to routine analysis of the substance for its purity checking.read more

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MF HANIF ,S U H QURESHI ,S PARVEEN ,

Bormination of Some Aromatic Compounds by Bromine in Acetic Acid

Bromination of some aromatic compounds is effected by means of bromine in acetic acid medium in the presence of a mixture of zinc dust and iodine as a catalyst. The compounds in­vestigated here are classified according to their behaviour towards the brominating agent into' (a) compounds which undergo full bromination, (b) compounds which are partially brominated, and ~~) compounds which are unchanged by the brominating agent.read more

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A F EL KAFRAWY ,M E SHABAN ,A I HASHEM ,

Synthesis of Tin (IV) Complexes of coordinates Number Six

A 1:2 adduct of tin tetrachloride with substituted urea was reported. By applying different techniques and conditions various coordination complexes of tin (IV) have been obtained. A series of tin (IV) complexes were synthesized and identified by the reaction of SnQ4 or the disubstituted tin (IV) tetrachloride, R2SnCI2, with 1,3-disubsti­tuted urea or thiourea. In all these complexes, the coordination number (4) of tin is thus inereasedto (6). The complexes were characterized by elemental analysis as well as by physical methods such as i.r., lH-n.m.r. and mass spectroscopy.read more

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R H A SAMN ,

Prepartion & Characterizsation of Fe(III), Co(II) and Complexes of tetrasuccinylurea

Tetrasuccinylurea (fS urea) has been synthesised and its chemical reactions have been studied. Fe(II1). Co (II) and Cu(lO complexes of TS urea have been prepared and their structures proposed on the basis of elemental analysis. IR and electronic spectral data.read more

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A M NASER ,A A SALMAN ,M A A EL GHAFFAR ,I M A ELLAH ,A N KHOUZONDAR ,

Acidic Fuctional Group on the Surface of Animal Charcaol

The surface acidity of the technical grade animal charcoal degassed at various tempera­tures was determined with bases of different strengths. The acidity on the surface of charcoal could be attributed to atleast two surface functional groups. The one which showed maximum decomposi­tion at 300oC. might be a CO2 evolving group. The other which still remained and appreciable amounts even when the charcoal was degassed at 700oC, might be some Co evolving group.read more

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W KEMP ,M A KHAN ,

Effect of the Substituents on the Infrared Adsorption of 2H-pyran-2-ones

Infrared carbonyl and carbon-carbon double bond frequencies in appropriate solution, solid state and nujol are presented for a number of substituted 2H-pyran-2~nes. The effect of- the substituents at the 3-,4- and 4,6-positions on the carbonyl absorption frequencies of the 2H-pyran-2­one has been interpret~d in te~s of chemical effects. The influence of the amino group at the 3­position, p-methoxy phenyl at 4 or 4,6-positios and hydroxystyryl at the 6-position of the 2-H­pyran-2~De has been found to lower the carbonyl absorption significantly as compared to the general­ly reported value of 1700 em-I OJ; above 1700 em-I.read more

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M SIDDIQ ,

Reaction of 1,5-Distituted -iondoline-2,3-dione with Arorylhydrazine

1,5-Dimethyl-indoline-2,3-dione when treated under various conditions with benzoyl hydrazine yields 1,5-dimethy1-3-{benzoylhydrazono)-indolin-2~ne. Spectral data of hydrazone and its benzoyl/acetyl derivative indicate that there is an intramolecular hydrogen bonding in I between the imino proton of hydrazone residue and t"e C-2 carbonyl group. read more

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A K S UPTA ,A A GUPTA ,

Some Liquid Phase Photobrominations of Biphenyl

Liquid phase photobromination of biphenyl (50-600q yields 0-, m-, and p-bromo­biphenyls, accompanying small amount of side-products, possibly adducts. The isomer distributions were measured by gas liquid chromatography. Unlike many heterolytic reactions, substitution at the meta-position takes place quite significantly. Tentative explanation for these fmdings are being com­municated. Relative rates and partial rate factors for photobromination of biphenyl and bromo benzene were also derived. Results are discussed on the basis of the reactivity of biphenyl against the attacking bromine radicals. The validity of the competitive methods is also taken into consideration.read more

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G H WILLIAMS ,M I BHANGER ,R BOLTON ,