α-Telluration of 2-acetylthiophene: Electronic influence of the heteroaromatic moiety on solid state structures

Stereospecific chlorotelluration of terminal acetylenes

“…Moreover, only a few vinyltellurium(II) derivatives have been structurally characterized and their configurations established in the solid state [13,17]. In continuation of our interest in functionalized organotelluriums [18,19], the adducts of 1-naphthyl-, mesityl-and anisyltellurium trichloride with phenylacetylene were, therefore, isolated and characterized structurally in the present investigation. The chlorotelluration of t-butylacetylene with these ArTeCl 3 as well as with TeCl 4 under similar conditions was also studied for comparison.…”

Furan derivatives of tellurium: Synthesis and structural comparison with the thiophene analogues

“…Bis(2-furyl)ditelluride, Fu 2 Te 2 (Fu ¼ 2-C 4 H 3 O) [2], bis(2-furyltelluro)methane, FuTeCH 2 TeFu [3], (2-furyl)methyltelluride, FuTeMe and its Pd-complex, Pd(FuTeMe) 2 Cl 2 [4] and bis (2-benzo[b] furoylmethyl)telluride, (BnzFuCOCH 2 ) 2 Te (BnzFu ¼ 2-C 8 H 7 O) and its dichloride (BnzFuCOCH 2 ) 2 TeCl 2 [5] are the few tellurium derivatives reported to date, of which only Fu 2 Te 2 [6] and Pd(FuTeMe) 2 Cl 2 [4] have been structurally characterized. In continuation of our studies on the electronic and steric factors of the organic ligands on the solid state structures of diorganotellurium (II and IV) derivatives in general [7,8] and those bearing heteroaromatic rings in particular [9,10], we have investigated and report herein the synthetic and structural aspects of some new furan derivatives of class (I) and (II). This communication details the isolation and characterization of (2-furoylmethyl)tellurium(II and IV) derivatives that have been obtained under ambient conditions by (i) oxidative addition of abromo-2-acetylfuran to Te(0) and aryltellurium(II) bromides and (ii) electrophilic substitution of 2-acetylfuran with the tellurium(IV) chlorides.…”

“…Similarly with I 2 , a dark red unstable solid was obtained. Te (6) was prepared as reported earlier (authentic melting point and 1 H NMR spectrum)[9].C{ 1 H} NMR: d 12.4 (CH 2 ), 21.0 (p-Me), 29.7 (o-Me), 117.7, 127.4, 127.8, 132.0, 133.7, 139.9, 142.7, 145.7 (aromatic carbons), 190.7 (CO) ppm. 125 Te{ 1 H} NMR: d 409 ppm.…”