Synthesis of 2,7-dihydro-3,4-5,6-dibenzotellurepin—a new heterocyclic compound

Synthesis and characterization of 2,7-dihydro-1H-dinaphtho[c,e]tellurepin: a new heterocyclic telluride

“…There are a few publications [1][2][3][4] dealing with the synthesis of tellurium seven-membered ring compounds in contrast to a large amounts of research was concerned with five-and six-member rings [5,6]. The first report [1] described the synthesis of a steroidal telluacycloheptane from the reaction of a steroidal methanesulphonate with sodium telluride; yield and physical data of the product were not given [1].…”

“…The second paper [2] deals with the synthesis of 3H-benzotellurepin by reacting o-diethynylbenzene with tellurium powder, hydrazine and sodium hydroxide [2]. Our recent works [3,4] described the synthesis of 2,7-dihydro-1H-dibenzo[c,e]tellurepin either by reduction of 1,1-diiodo-2,7-dihydro-1H-dibenzo[c,e]-tellurepin [3] or by reaction of 2,2'-bis(bromomethyl)biphenyl with potassium tellurocyanate [4]. Thus, as a part of research on the synthesis and donor properties of heterocyclic tellurium compounds [3,4,7,8], we now report the synthesis of an axially dissymmetric cyclic telluride (i.e., 2,7-dihydro-1H-dinaphtho-[c,e]tellurepin (1)) in a chiral form.…”

Synthesis and Study of Charge-transfer Complexes for 5,6-dimethyl-2,1,3-benzoselenadiazole

“…This change can be attributed to the formation of complexes and the deviation of electron cloud around selenium atom. The electron donors, the quinones, decrease the n-π* and π-π* conjugate effect in chromophoric group and increase the energy needed for the n-π* and π-π* transitions [17][18][19][20], resulting shifting in the absorption band toward shorter wave length.…”