On the occurrence of Eulophia spectabilis (Dennst.) Suresh [Orchidaceae] in Uttarakhand

The present communication reports the first authentic specimen of Eulophia spectabilis (Dennst.) Suresh from Uttarakhand.

CYCLOHEXANE COMPOUNDS: V. THE REACTION OF 1-METHOXYCYCLOHEXENE-2 WITH AQUEOUS N-BROMOSUCCINIMIDE. THE 1-METHOXY-2-BROMO-3-HYDROXYCYCLOHEXANES

Interaction of 1-methoxycyclohexene-2 and aqueous N-bromosuccinimide gave a mixture of stereoisomeric bromohydrins, which, on treatment with aqueous sodium hydroxide, furnished 1β-methoxy-2α,3α-epoxycyclohexane (I) and 1α-methoxy-2α,3α-epoxycyclohexane (II) in the ratio 3:1. The mixture from the N-haloimide-olefin reaction was separated by preparative vapor phase chromatography into three isomeric bromohydrins, 1α-methoxy-2α-hydroxy-3β-bromocyclohexane (IV), 1α-methoxy-2α-bromo-3β-hydroxycyclohexane (V), and 1α-methoxy-2β-bromo-3α-hydroxycyclohexane (VI) in the relative proportions 1:10:4. The 3-bromo isomer IV was identified by comparison with an authentic specimen prepared by the action of hydrobromic acid on the oxide II. Compounds V and VI were shown to have the indicated structures by deetherification to the corresponding bromodiols VII and VIII in high yield, followed by debromination of the latter to trans- and cis-1,3-cyclohexanediol respectively. The product distribution is considered in relation to the intervention of electronic and steric factors in a possible mechanism suggested for the reaction between aqueous N-bromosuccinimide and 1-methoxycyclohexene-2.

Bassetite and uranospathite

Bassetite and uranospathite Were described as new uranium minerals from Cornwall in 1915 by A. F. Hallimond, to whose paper reference should be made to supplement the descriptions given here. The position of both minerals as relatives of autunite was recognized by Hallimond. Unfortunately, chemical analyses could not be obtained and the composition of these minerals has remained uncertain. No further information has been published about uranospathite. In 1940 Meixner reported that microchemical tests of an apparently authentic specimen of bassetite from Cornwall indicated that the mineral was a hydrated iron uranyl phosphate.