TCNE—See Tetracyanoethylene

Tetracyanoethylene (TCNE) coordinates weakly to Ph3E (E = As, Sb, Bi) in CH2CI2 solution to form Ph3E TCNE complexes . Reaction of phenyldichlorarsine PhAsCl2 with K2SN2 led to the formation of the diarsine Ph2As—N=S=N—AsPh2 with weak intramolecular As As interactions (337.9 pm) (see 6) L... 

In the presence of tetracyanoethylene (TCNE), photocyclization of 2-azido-biphenyi gives carbazole as the main product, but an appreciable amount of a spiroazepine is also formed. Reviews of the chemistry [3746] of TCNE and of its use in cycloadditions [3244] are available. The synthesis of an indole by thermolysis of a previously prepared side-chain azide (see p. 301) is a widely used method but such an azide may also be formed in situ, as in this conversion of a benzaldehyde to an indole-2-carboxylic ester. 

From charge-transfer bands in the visible spectral region observed immediately upon mixing Pb(CH3)4 and tetracyanoethylene (TCNE) in CHCI3, CH2CI2, or 1,2-dichloropropane, formation of a 1 1 electron donor-acceptor complex (Pb(CH3)/ TCNE ) was inferred [4, 5, 8] see also Section 1.1.1.1.4.6, p. 138. 

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