Propargyl-, Allenyl-und Alkinyl-Phosphane; Synthese, Reaktivität, Isomerisierung* Propargyl-, Allenyl-and A lkynyl-Phosphanes; Synthesis, R eactivity, Isom erization H einrich L a n g +, Uwe Lay, M ichael Leise und Laszlo Zsolnai A norganisch-C hem isches In stitut der U niversität, Im N euenheim er Feld 270, D-W -6900 H eidelberg 1 Z. N atu rfo rsch . 48b, 2 7 -3 6 (1993); eingegangen am 23. M ärz 1992 P ropargyl, Allenyl and Alkynyl P hosphanes, C o o rd in atio n A bility, Isom erization, C rystal S tructure T he synthesis and reactivity o f non-co o rd in ated an d c o o rd in ated pro p arg y l pho sp h an es are discussed. T he isom erization o f the propargyl unit in (R )P(C 1)(C H 2C = C H ) (3) (R = 2,4,6-'B u3C 6H 20 ) in the presence o f N E t3 yields the^ allenyl su b stitu ted p ro d u ct (R)P(C1)(CH = C = C H 2) (4). H ow ever, in the presence o f H N E t2 the dim ethylenecyclobutane 7 is form ed.D ifferent synthetic pathw ays for theAll new co m pounds have been characterized by analytical a n d spectroscopic d a ta (IR , 'H -, 13C { 'H } -, 31P { 'H } -N M R , M S) an d (;/5-C 5H 5)(C O )2M n P (P h )(C H 2C = C H )2 (13a) by X -ray analysis.
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