The major product from the photoreaction of 4-methylenedispiro[2,1,2,3]decane (5) with Fe(CO), is shown to be a tricarbonyliron a,n-complex of structure (7), whereas the products from Pmethylenespiro[2,4]heptane (9) and 4-methylenespiro [2, Bloctane (15) are the respective bi-cyclic enones (12)-(13) and (16). OUR study of the thermolysis' and photolysis3 of vinylcyclopropenes in the presence of Fe(CO), has indicated that the small ring may be cleaved via two distinctly different reactions; (a) the Fe(CO),-induced metal insertion into a CH, + Fe(COI, (31 strained o-bond coupled with hydrogen migration to provide diene-Fe(CO), n-complexes [(l) + (2)]; (b) thephoto-induced cycloinsertion of carbon monoxide across the 'homodienic system' to yield cyc1ohexenones.i The only example in which these two reactions take place con-currently is that of 1, 1-dicyclopropylethylene (1), which on on thermolysis with Fe(CO), gives rise to a 1 : 1-mixture of (2) and (4)Ibs4 and on photolysis yields predominantly the cyclohexenone (4) product. Since the n-complex (2) is inert
Von den durch Wittigreaktion der Ethanotetralone (I) zugänglichen Titelverbindungen (II) liefert (IIa) mit den Reagenzien (III), (VII) bzw. (VIII) die Produkte (IV) [nachfolgende thermische Isomerisierung zu (V)], (IXa) bzw. (IXc) [ im 4:1‐Gemisch mit dem E‐Isomeren (IXb) (nicht rein darstellbar)]; (IIb) gibt mit den gleichen Reagenzien die Verbindungen (VI) , (Xa) bzw. (Xb).
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