"661543" . "645,664-" . "3" . "P(GA106/00/0580), Z(MSM 223100001)" . . "Svoboda, Ji\u0159\u00ED" . . . "20"^^ . . "Reactivity of [1]benzothieno[3,2-b][1]benzothiophene" . "benzothiernobenzothiophene; electrophilic substitution; metallation"@en . "0010-0765" . . "67" . "Reactivity of [1]benzothieno[3,2-b][1]benzothiophene"@en . . . . "RIV/60461373:22310/02:00006476" . . . . . . "Electrophilic nitration, formylation and acetylation of the title heterocycle 1 were studied. Monosubstitution proceeds preferentially in position 2 and to a lesser extent in position 4. Lowering the reaction temperature substantially increases regioselectivity of nitration and acetylation. Substitution reactions of the 2-substituted derivatives of 1 led to the corresponding 2,7-disubstituted derivatives as major products. Formation of other regioisomers was also observed. Metallation of 1 with butyllithium preferably proceeds in position 1; subsequent reaction with N,N-dimethylformamide, carbon dioxide or iodine gives rise to corresponding 1-substituted derivatives. Long-chain 2,7-disubstitued derivatives exhibit liquid-crystalline properties." . . "Kozm\u00EDk, V\u00E1clav" . . "RIV/60461373:22310/02:00006476!RIV/2004/GA0/223104/N" . "3"^^ . . . "3"^^ . "Collection of Czechoslovak Chemical Communications" . "Reactivity of [1]benzothieno[3,2-b][1]benzothiophene" . "0"^^ . "Electrophilic nitration, formylation and acetylation of the title heterocycle 1 were studied. Monosubstitution proceeds preferentially in position 2 and to a lesser extent in position 4. Lowering the reaction temperature substantially increases regioselectivity of nitration and acetylation. Substitution reactions of the 2-substituted derivatives of 1 led to the corresponding 2,7-disubstituted derivatives as major products. Formation of other regioisomers was also observed. Metallation of 1 with butyllithium preferably proceeds in position 1; subsequent reaction with N,N-dimethylformamide, carbon dioxide or iodine gives rise to corresponding 1-substituted derivatives. Long-chain 2,7-disubstitued derivatives exhibit liquid-crystalline properties."@en . "0"^^ . "Reactivity of [1]benzothieno[3,2-b][1]benzothiophene"@en . . "CZ - \u010Cesk\u00E1 republika" . "Ko\u0161ata, Bed\u0159ich" . . "22310" . "[210568C8615D]" .