Crystal Structure of η3-lithio-1,3,3-triphenylpropyne-(diethyl ether)2 and [1-lithio-1-(2-methoxyphenyl)-3,3-diphenylallene–diethyl ether]2: Propargyl- versus allenyl-type structuresстатья
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Аннотация:Crystal structure investigations reveal that η3-lithio-1,3,3-triphenylpropyne-(diethyl ether)2 [6 · (OEt2)2] is of the propargyl structural type while [1-lithio-1-(2-methoxyphenyl)-3,3-diphenylallene-(diethyl ether)]2 {[7 · OEt2]2} is of the allenyl type. The assignment of the different structural types is mainly based on a comparison of the bond lengths C1-C2 and C2-C3 as well as of the difference ΔC[BOND]C of these two bond lengths with the corresponding values of theoretical models of the propargyl and allenyl type. This leads also to a correction of an earlier assigned structural type.