摘要:
Proton-transfer, low self-absorbing chromophores of formula (1) wherein R2 and R3 are independently hydrogen, alkyl, aryl, cyano, nitro, halo or an ether group, R4 is O or N-H, and R5 is thienyl, naphthyl, furanyl, pyrrolyl, phenyl vinyl, diphenyl vinyl, phenyl ethynyl, hydroxy chromonyl phenyl, didecyloxy hydroxy chromonyl phenyl, phenyl or (a) wherein R1 is vinyl, vinyl phenyl, vinyl benzyl, alkyl ethenyl, or alkyl phenyl ethenyl, provided that when R5 is phenyl and R2 and R3 are hydrogen, R4 is N-H.
摘要:
A process for preparing N-acyl, N-sulfonyl and N-phosphoryl substituted isoserine esters in which an ammonium alkoxide is reacted with a beta -lactam.
摘要:
Taxane derivatives having alternative C7 substituents wherein the substituents are independently selected from the group consisting of hydrogen and acyloxy. The derivatives are valuable antileukemia and antitumor agents.
摘要:
A metal alkoxide having the following formula: (1) wherein T1 is hydrogen or a hydroxy protecting group, Z is -OT2, or -OCOCH3, T2 is hydrogen or a hydroxy protecting group, and M is selected from the group comprising Group IA, IIA and transition metals are useful in the preparation of biologically active derivatives of baccatin III and 10-deacetyl baccatin III.
摘要:
A metalorganic chemical vapor deposition (MOCVD) method for depositing an F-series metal onto a semiconductor or other substrate or for incorporating nitrogen as a p-type dopant in Group II-VI semicconductor materials. The MOCVD method utilizes an F-series metal amide or zinc amide composition as the source compound for the F-series metal or nitrogen, respectively. Novel erbium amide and zinc amide compositions are disclosed along with methods for preparing the metal amide compositions.
摘要:
Taxane derivatives, useful as anti-tumor and anti-leukemia agents, having alternative C9 substituents wherein the substituents are selected from a group consisting of hydrogen, hydroxy, protected hydroxy and acyloxy.
摘要:
Process for the preparation of a derivative or analog of baccatin III or 10-desacetyl baccatin III having a C2 substituent other than benzoate and/or a C4 substituent other than acetate in which the C2 benzoate substituent and/or the C4 acetate substituent of a derivative of baccatin III or 10-desacetyl baccatin III is/are selectively reduced or hydrolyzed to the corresponding hydroxy group(s) and converted to R31COO- and/or R30COO-, respectively, wherein R30 and R31 are independently H, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, monocyclic aryl or monocyclic heteroaryl.
摘要:
A specimen holder (10) including a housing (12) having a specimen chamber (14) in it. A window (16) defining a wall of the chamber allows transmission of at least a portion of the x-radiation from X-ray diffraction spectometry apparatus on which the holder is mounted, into the chamber. The housing has a passageway in it opening at one end into the specimen chamber (14) and at the opposite end to outside the housing. A cylindrical specimen mount (50) supports the specimen in the housing is constructed for sealing sliding reception in the passageway such that the specimen mount is rotatable about its longitudinal axis and movable lengthwise of the passageway while maintaining a seal with the passageway for positioning the specimen in the specimen chamber (14).