V. Venkateswarlu

Chemical examination of Cassia fistula

Abstract The bark and hardwood of Cassia fistula containing fistucacidin, an optically inactive leucoanthocyanidin, 3,4,7,8,4′-pentahydroxyflavan (I) along with barbaloin (II) and rhein (III).

Chemical examination of Ardisia macrocarpa wall

Abstract The bark and hardwood of Ardisia macrocarpa Wall contain rapanone (I), along with a leucoanthocyanidin, (−)3,4,5,7,3′,4′,5′-heptahydroxyflavan (II).

Chemical examination of Embelia ribes—II : Analogues of vilangin and anhydrovilangin

Abstract By the condensation of embelin (I) with various aldehydes, analogues of vilangin (II) and anhydrovilangin (III) have been synthesized and their properties recorded.

Chemical examination of embelia ribes—VII : Synthesis of some new N-Bis(anhydrobenzoquinones)

Abstract By the condensation of 2,5-dihydroxyl-1,4-benzoquinone (I) with various nitroso compounds, the corresponding N-bis(anhydro-2,5-dihydroxy-3,6-benquinones) (II) were obtained and their properties recorded.

Chemical examination of embelia ribes—IV : Some condensation reactions of embelin with primary amines

Abstract By the condensation of embelin (I) with various primary amines the corresponding quinone di-imines (II) have been obtained and their properties recorded.

GRAVIMETRIC DETERMINATION OF THORIUM USING SOME CARBOXYLIC ACIDS

Some synthetic carboxylic acids were investigated. Determinations were completed by ignition to thoria. O-bromobenzoic acid was useful for separating Th from rare earths. (P.C.H.)

Chemical examination of embelia ribes—VI : Synthesis of some new methylene-bisbenzoquinones

Abstract By the condensation of 2,5-dihydroxybenzoquinone (I) with various aldehydes (bis-desundecyl)vilangins and anhydrovilangins (II and III), have been synthesized and their properties recorded.

The chemistry of flavans and related compounds—I

Abstract Starting from 7-hydroxy-6-ethylflavan (I) and its formyl derivative (IV), 6-ethyl-(7,8,2′,3′)-chromonoflavan (III) of the draconal type and α-pyronoflavans have been synthesized.

Chemical examination of embelia ribes—VIII : Some condensation reactions of rapanone with various aldehydes and nitroso compounds

Abstract The condensation of rapanone1 (I) with various aldehydes and nitroso compounds yields the corresponding methylene-bis(2.5-dihydroxy-4-tridecyl-3,6-benzoquinones) (II) or their anhydro derivatives (III). The N-bis(anhydro-5-hydroxy-4-tridecyl-3,6-benzoquinones) (IV) have been synthesized and their properties recorded.

Chemical examination of Embelia ribes—V : Synthesis of some N-bis(anhydrobenzoquinones)

Abstract By the condensation of embelin (I) with various nitroso compounds, the corresponding N-bis-anhydrobenzoquinones (II) have been synthesized and their properties recorded.