Patent ID: 6020452
Filing Date: 2000-02-01
Classification: C08G

Abstract:
A biphenyl compound having the formula: ##STR13## wherein X is --OR.sup.18, --NR.sup.19 R.sup.20, or --SR.sup.21, wherein R.sup.18, R.sup.19, R.sup.20, and R.sup.21 are independently, hydrogen, alkyl, cycloalkyl, aryl, or aralkyl,Y and Z are independently H, Cl, Br, I, B(OH).sub.2, or substituted or unsubstituted aryl or aralkyl,R.sup.1 and R.sup.2 are hindering groups wherein R.sup.1, R.sup.2 or a combination thereof provides sufficient hindrance to internal rotation such that the 2,2'-substituted biphenyl subunits have an enantiomeric interconversion rate of no more than about 1% per hour at 100.degree. C.,R.sup.3 and R.sup.4 are independently hydrogen, alkyl, alkoxy, alkynyl, aryl, aralkyl, vinyl, trialkylsilyl, triarylsilyl, --CONR.sup.5 R.sup.6, --CO.sub.2 R.sup.7, --SO.sub.2 R.sup.8, --NR.sup.9 R.sup.10, or halogen, wherein R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9 and R.sup.10 are independently alkyl, aralkyl or aryl, or R.sup.1 and R.sup.3 form a substituted or unsubstituted first fused ring or R.sup.2 and R.sup.4 form a substituted or unsubstituted second fused ring,R.sup.11 is alkyl or cycloalkyl, andR.sup.12 and R.sup.13 are independently hydrogen, halogen, alkyl, cycloalkyl, alkoxy, cycloalkoxy, trialkylsilyl, or triarylsilyl.