Phenanthrenes perhydro

The acid 19 has been dimerized, although in low yield, in the course of a perhydro-phenanthrene synthesis [141]. When the oxidation potential of the double bond is sufficiently lowered by alkyl substituents, lactone formation by oxidation of the couble bond rather than of the carboxyl group occurs (Eq. 7) [142] (see also chap. 15). 

The CD of all trans-fused ketones belonging to the perhydro-naphthalene, -anthracene, -naphthacene and -phenanthrene has been reported. These studies provided the pure ring... 

Diphenic acid (17) and its ester as well as ci s-hexahydro-2,2 -diphenic acid (18) are all hydrogenated largely to give cw- yn-aT-perhydro derivatives over platinum oxide in acetic acid, in the same stereochemical manner as do its anhydride and the phenanthrene derivatives related to it (Scheme 11.12).198,199 Linstead et al. explained the results on the assumption that the diphenic acid or its ester are hydrogenated in the coiled form (17a), rather than in the zigzag form (17b), which is expected to yield the product with a cis-anti-cis configuration.62... 

The characteristic structure of sterol is their steroid nucleus consisting of four fused rings, three with six carbons (Phenanthrene) and one with five carbons (cyclopentane). This parent structure is known as perhydro cyclopentano phenanthrene. Cholesterol is the most abundant sterol in animals. Cholesterol... 

Steroids are ubiquitous members of a large class of carbon compounds of marine and terrestrial origin, having a perhydro-l,2-cyclopentano-phenanthrene ring system. Steroidal alkaloids have been the subject of... 

Phenanthrenchinon wird durch Raney-Nickel bei 110° (60 bar) unter gleichzeiti-ger Hydrierung der beiden auBeren Ringe zum Hydrochinon (9,10-Dihydroxy-1,2,3,4,5,6,7,8-octahydro-phenanthren), bei 160° zu einem Isomerengemisch von 9,10-Dihydroxy-perhydro-phenanthren umgewandelt1. 

Phenanthrene to Dihydro-Phenanthrene to Tetrahydro-- - Phenanthrene to Perhydro--a- Tetrahydro- to sym-octahydro--A- sym -Octahydr-o to Perhydro-Naphthalene to Tetralin Tetralin to Decalins 3... 

Polyaromatics react under hydrocracking conditions to undergo partial or complete saturation of the aromatic rings, together with isomerization and cracking of intermediate and perhydro products. Phenanthrene, for example, can lead to tetralin and methyl cyclohexane as the principal products. With a platinum/ silica-alumina catalyst,67 the major products are isomerized perhydrophenan-threnes, which includes some adamantanes and cracked products, the total number of products exceeding 100. 

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