Facile Multistep Synthesis of Isotruxene and Isotruxenone
摘要:
Three multistep approaches toward facile syntheses of isotruxene (1) and isotruxenone (3) are reported. The ortho-para conjugated backbone in the precursor 4 was constructed by either Co-catalyzed [2 + 2 + 2] cyclotrimerization or the [4 + 2] Diels-Alder reactions. The regioselectivity of the triple intramolecular Friedel-Crafts acylation of 4 plays the key role in determining the overall yield. Compared to the previous one-step method, the current approaches are more efficient in terms of product yield (27-36% vs 4-18%) and purification (i.e., free of column chromatography).
Facile Multistep Synthesis of Isotruxene and Isotruxenone
摘要:
Three multistep approaches toward facile syntheses of isotruxene (1) and isotruxenone (3) are reported. The ortho-para conjugated backbone in the precursor 4 was constructed by either Co-catalyzed [2 + 2 + 2] cyclotrimerization or the [4 + 2] Diels-Alder reactions. The regioselectivity of the triple intramolecular Friedel-Crafts acylation of 4 plays the key role in determining the overall yield. Compared to the previous one-step method, the current approaches are more efficient in terms of product yield (27-36% vs 4-18%) and purification (i.e., free of column chromatography).
申请人:THE COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:EP0801089A1
公开(公告)日:1997-10-15
The invention provides process for the preparation of a branched poly(arylcarbonate) suitable for use in blow molding, which process comprises subjecting a linear (arylcarbonate) crystallized oligomer derived from a dihydroxy diaryl compound and a diarylcarbonate to solid state polycondensation by heating the oligomer at a temperature, which is higher than its glass transition temperature but below its melting point, in the presence of a multifunctional phenol and, optionally, a catalyst, under an inert atmosphere.
Thermoplastic Resin Composition and Optical Element Utilizing the Same
申请人:Kikuchi Masako
公开号:US20070265381A1
公开(公告)日:2007-11-15
A thermoplastic resin composition comprising a thermoplastic resin and inorganic particles dispersed in the thermoplastic resin, the thermoplastic resin being melt-moldable, wherein n
d
and v
d
of the thermoplastic resin composition satisfy Formula (1), provided that n
d
represents a refractive index measured at a wavelength of 588 nm and v
d
represents an Abbe's number:
n
d
>1.82−0.0042
v
d
Formula (1)
US5710238A
申请人:——
公开号:US5710238A
公开(公告)日:1998-01-20
Facile Multistep Synthesis of Isotruxene and Isotruxenone
作者:Jye-Shane Yang、Hsin-Hau Huang、Shih-Hsun Lin
DOI:10.1021/jo900299q
日期:2009.5.15
Three multistep approaches toward facile syntheses of isotruxene (1) and isotruxenone (3) are reported. The ortho-para conjugated backbone in the precursor 4 was constructed by either Co-catalyzed [2 + 2 + 2] cyclotrimerization or the [4 + 2] Diels-Alder reactions. The regioselectivity of the triple intramolecular Friedel-Crafts acylation of 4 plays the key role in determining the overall yield. Compared to the previous one-step method, the current approaches are more efficient in terms of product yield (27-36% vs 4-18%) and purification (i.e., free of column chromatography).