9,10-Dihydro-3-thia-benzo[f]azulen-4-one → 4-(2,4-Dichloro-benzylidene)-9,10-dihydro-4H-3-thia-benzo[f]azulene

Participants

Reaction Steps

Following the procedures essentially as described in Example 238 and using 9,10-dihydro-3-thia-benzo[f]azulene-4-one (23.3 mg, 0.108 mmol) and solution of 2,4-dichlorobenzyl magnesium chloride (0.325 mmol) in THF provides, after dehydration, 12.5 mg (32%) of the title compound as a 3:1 mixture of E- and Z-isomers: 1H NMR (CDCl3) δ 2.88-3.40 (m, 4 H), 6.26 (d, J=4.8 Hz, 1/4 H), 6.50 (d, J=8.2 Hz, 3/4 H); 6.63 (s, 1/4 H, Z), 6.74 (s, 3/4 H), 6.76 (td, J=8.6 Hz, 2.0 Hz, 3/4 H), 6.88 (td, J=8.2 Hz, 1.2 Hz, 3/4 H), 6.96 (s, 3/4 H), 6.95-6.98 (m, 15/4 H), 7.28 (d, J=2.0 Hz, 3/4 H), 7.34 (d, J=2.4 Hz, 1/4 H), 7.35-7.38 (m, 1/4 H); TLC shows >95% purity: Rf=0.20 hexanes).

Provenance & Evidence