Dienes, hybridization carbonylation

In addition to the ring opening of cyclopropenes noted above, vinylketene complexes 103 have been prepared by (1) ligand initiated carbonyl insertion of vinyl carbene complexes 104 and (2) benzoylation of a, -unsatnrated acyl fenates 105 (Scheme 20)". X-ray diffraction analysis of these vinylketene complexes indicates that the structure may be best represented as a hybrid between an -diene type complex (103 ) and an r] -allyl-zy -acyl complex (106). The Fe-Cl distance (ca 1.92 A) is shorter than the Fe-C2, Fe-C3, or Fe-C4 distances (ca 2.1-2.2 In addition, the C—C—O ketene array... 

Petunia steroids. The leaves of Petunia hybrids (So-lanaceae) contain a tetrahydroxylated ergosta-1,4-dien-3-one existing as the orthoester of 2-(methylthio-carbonyl)acetic acid and named as petuniasterone A C32H4s06S, Mr 558.77, mp. 130-135 °C, [a]D+52.r (CHCI3)). This compound is responsible for the potent growth retarding effects of the plant on the insect Heliothis zea. 

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