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Compared with the tertiary phosphane P(C 7 H 7 ) 3  (1), the amine N(C 7 H 7 ) 3  (2) possesses the structure of a flattened trigonal pyramid with a sum of CNC angles of 350.0° (cf. 300.2° (av.) in 1). The heteroatom (with the lone pair) is situated 27.0 pm above the C 3  basal plane in 2, but 86.4 pm in 1. The amines N(C 7 H 7 ) 3  (2), NH(C 7 H 7 ) 2  (2a) and N(Ph)(C 7 H 7 ) 2  (2b) react with tropylium tetrafluoroborate, [C 7 H 7 ]BF 4 , to give N-tropylidene-(1-cyclohepta-2,4,6-trienyl)-immonium tetrafluoroborates, [(C 7 H 6 )N(R)(C 7 H 7 )]BF 4  3 (R = H, from 2 and 2a), 4 (R = Ph, from 2b), which have been characterized by their IR and NMR ( 1 H,  13 C) spectra.

Molecular Structure and Reactivity of Tri(1-cyclohepta-2,4,6-trienyl)amine, N(C 7 H 7 ) 3