1 -butyl-1 - cyclopentan

S, lS)-5-Hydroxy-2-oxo-1 -methyl-1 -(3-oxo-butyl)-cyclopentan Rh. arrhizus ATCC 11145 ... 

C8H18 3-methylheptane 589-81-1 1.233E-H10 88.710 17859 C9H18 butyl cyclopentane 2040-95-1 1.213E-h10 90.850... 

The main hydrogenolysis product in Table 11 and Fig. 67 is 1,3-bis(3-methyl-butyl)cyclopentane (peak numbers 6 and 7). It can be obtained separately by adsorption chromatography on silicagel with iso-octane as eluent or by vacuum distillation at 105°C and 13 mm Hg (37). Another procedure is Clemmensen reduction, followed by catalytic hydrogenation, whereby two cis-trans isomers are obtained (37). The 2,4-bis(3-methylbutyl)-2-cyclopentenone (peak number 11) can be obtained by reduction of the dihydrodeoxohumulinic acids or of compound 142 with lithium aluminium hydride and preparative gas chromatographic separation (58). 

Cyclohexene-l,4-dione, 2,3,5-tiichloro-3, 6-bis(l,l-dimethylethyl)- [5-Cyclo-hexcne-1,4-dione, 2,3,5-tnchloio-3,6-dwert-butyl-], 55, 33 Cyclopentadiene, 55, 15,16 Cyclopentane acetyl-,55,25 Cyclopentane 1-cyano-l-phenyl-, 55,94 Cyclopentane methyl-, 55, 62 Cyclopropane, 1-acetyl-l-phenyl-, 55 94... 

Die Elektrolyse von 1-Chlor (bzw. Brom, Jod)-l-phenyl-l-hexin liefert in Abhangig-keit vom Kathodenpotential verschiedene Produkte. So wird z.B. bei -2,85 V ausschlieB-lich 1 -Phenyl-hexan erhalten, bei anderen Potentialen fallen Gemische von 1-Phenyl-cy-clohexen, Benzyl-cyclopentan und l-Phenyl-hexen-(5)-in-(l) an. l-Brom-5-decin liefert bei -2,7 V neben 5-Decin (59% d.Th.) 1 -Butyl-cyclohexen (38% d.Th.)1. 

Borylphosphinoethene derivatives were synthesized by varying the dipolar reagents. Thus, (176) appeared to interact with /-butyl isocyanide as trialkylborane, yielding unstable iminoborane 178. The latter forms 2-phosphinoethenyl-l-bora-2,4-diazacyclopentane (179) with ben-zalaniline and 1 -hydroxy-1 -phosphinoethyl-1 -borata-2-ammonia-4-aza-cyclopentane-2 (180) with acetonitrile [Eq. (134)] (90IZV2147). 

Radical [3 + 2 cycloaddition. Cyclopentanes can be prepared by addition of alkenes across vinylcyclopropanes catalyzed by phenylthio radicals formed from (C6H5S)2 and AIBN. A Lewis acid such as A1(CH3)3 can increase the rate and the stereoselectivity of this radical initiated cycloaddition. Thus the combination of the vinylcyclopropyl ester 1 with f-butyl acrylate (2) provides the four possible cyclo-... 

VINYL PROPIONATE 2-HYDROXYETHYL ACRYLATE LEVULINIC ACID METHYL ACETOACETATE GLUTARIC ACID VALERONITRILE n-BUTYL ISOCYANATE N-HETHYL-2-PYRROLIDONE L-GLUTAMIC ACID CYCLOPENTANE 2-METHYL-1-BUTENE... 

Similarly to the perhydrobenzoxazines 31-33, the cyclopentane d -and e -fused derivatives and some of their tert-butyl-substituted derivatives have also been prepared [80LA122 87JCS(P1)515, 87T1863 94ACH(131)435]. 

Table 2 Bond lengths and angles in l,3-di-t-butyl-l,3-diaza-2-germa (Il)-cyclopentane and 1,3-diaza-...

Both fragranol and grandisol skeletons were obtained by treatment of racemic butyl 6,7-epoxygeranyl sulfide with butyllithium in 7V,7V,Ar, 7V -tetramethylethylenediamine (TMEDA). In addition to the trans-product trans-16 (fragranol skeleton) and the ra-product m-16 (grandisol skeleton), a cyclopentane derivative was also isolated.16... 

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