triturated with methylene chloride. Evaporation of the methylene chloride left a residue of 1.34 g. This was heated at 170°until cessation of gas evolution (~30 min). The crude mixture of amino monoacids (1.0 g) was dissolved in 10 ml of absolute ethanol, saturated with HC1, and heated under reflux overnight. Neutralization with aqueous KOH followed by extraction with ether gave 0.70 g (62%) of amino ester mixture 5 and 6.Chromatography of 250 mg of this mixture on 10 g of Florisil gave 27 mg of essentially pure 5 (eluted with 1:1 ether-hexane): X (CC14) 3.58, 5.78, 8.50, 9.66 µ; r (CC14) 5.97 (2 H, q, J = 7 Hz), 7.3-9.4 (21 H, m, containing t at 8.77, J = 7 Hz); m/e 213 (parent), 84 (base peak).
Aus den stereoisomeren Anhydriden (Ia) und (IIa) erhält manüber die Azide (Ib) bzw. (IIb) bei der Umlagerung die isomeren 2‐Benzoylcyclopropanisocyanate (Ic) bzw. (IIc).
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