LIGAND EFFECT OF CATALYTIC SYSTEM WCl_6-Et_2Al FOR RING OPENING METATHESIS POLYMERIZATION OF DICYCLOPENTADIENE

INTRODUCTIONInrecentyearsresearchprojectsonROMPofcycloolefinshavebeenattractingattentionofscientistsengagedinthesynthesisanddesignofnewpolyTneric'AprojectsupportedbytheNationalNaturalSCienceFoundationofChina(projectapprovalnumber:29474160).'-Correspondingauthormaterials,amongthemROMPsofnorbornene,norbornenederivativesandDCPDhavefoundgrowingfavourinthechemists,.y.,LI--4].Acrosslinkedpolarer(PDCPD),anewplastic,possessingexcellentmechanicalproperties(highNIS,TSetc)a-ndgoodthermal…     

Synthesis and Crystal Structure of （Et4N）3[{V（o—C6H4OS）3}2Na]

ＳｙｎｔｈｅｓｉｓａｎｄＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆ（Ｅｔ_４Ｎ）_３［｛Ｖ（ｏ－Ｃ_６Ｈ_４ＯＳ）_３｝_２Ｎａ］￥ＷｅｎＴｉｎｇ－Ｂｉｎ；ＸｕＹｏｎｇ－Ｊｉｎ；ＳｈｉＪｉ－Ｃｈｅｎｇ；ＤｅｎｇＹｕ－Ｈｅｎｇ；ＣｈｅｎＣｈａｎｇ－Ｎｅｎｇ；Ｌｉｕ...     

The Molybdenum（0）Complex [Et4N]2[Mo2（CO）6（pys）2]（pys=Pyrindine—2—thiol

The title compound tetraethylammonium hexacarbonylbis(μ-pyridine-2-thiolato-S∶S) dimolybdenum [Et4N]2[Mo2(CO)6(pys)2] crystallizes in the monoclinic, space group, P21/c with a=13.217(2), b=21.648(2), c=27.193(6)(), β=82.52(2)°, V=7714.6()3, Z=8, Mr=840.77, Dc=1.45 g/cm3, μ=7.8 cm-1, R=0.038 and Rw=0.040 for 6082 reflections with I≥3σ(I). X-ray crystal structure study reveals that the asymmetric unit of the title compound is comprised of two independent formulations of the molecular formula. Each dianion has approximate C2 symmetry and the dimetallic Mo2S2 core adopts a "butterfly" conformation with a dihedral angle between the halves of 139.3(1)° for the first independent anion and 142.8(1)° for the second one. The two pyridine rings lie on the same side of the molecule in a cis arrangement and the Mo...Mo separations are 3.76(1) and 3.838(1)().