Furan-TCNQ

The weaker electron accepting ability of 1 than TCNQ is based on less aromaticity of the central heterocyclic ring formed upon the reduction process. This is the case for other hetero-TCNQs. The selenophene-TCNQ 2 and the furan-TCNQ 3 have the same first reduction potential (4-0.03 V), which is slightly lower than that of 1. Considering the following order of aromaticity, thiophene > selenophene > furan [31], this result means that the inductive effects of the introduced heteroatoms, especially the oxygen atom of... 

Papers have appeared concerned with (i) the migratory aptitude of 2-furyl relative to vinyl and ethyl groups. In the vapor phase on alumina the order is the same as that in acidic solvents457 (ii) the effect of complex-ation with BC1, or TCNQ upon the aromaticity of furan,458 (iii) the molecular rotational Zeeman effect in 3-methylfuran459 and (iv) microwave and H-NMR spectra and the molecular dimensions of furan when held in a nematic phase provided by methoxybenzenene azophenylcaproate 460... 

Ethynylated 2/f-cyclohepta[()]furan-2-ones 486 are prepared by Pd-catalyzed alkynylation of 3-iodo-5-isopropyl-2//-cyclohepta[ ]furan-2-one 487 with the corresponding ethynylarenes [292]. The compound reacts with tetracyanoethy-lene (TCNE) 488 and TCNQ 25 to afford highly polarized dicyanoethylene derivatives 489 and 490 respectively (Scheme 6.128) [293]. 

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