摘要:
A process for preparing an intermediate compound of formula (II) where X is as defined in the specification, R1 is haloalkyl, alkyl, alkenyl, cycloalkyl, carboxyalkyl, alkoxycarbonylalkyl, aryl or arylalkyl; R2, R3, R4 and R5 are organic groups as defined in the specification, which process comprises aromatisation of a compound of formula (III) where R1, R2, R3, n, X and R5 are as defined in relation to formula (II) and R4′ is a group R4 or a precursor group thereof, and thereafter if necessary or desired, carrying out one or more of the following steps: (i) removing any hydroxy-protecting groups R; (ii) converting a precursor group R4′ to a group R4, or where R4′ is a group R4, converting it to a different such group. Compounds obtained are useful intermediates for example in the preparation of fulvestrant. Novel intermediates are also claimed.
摘要:
This disclosure relates to feed mechanisms for sewing machines, particularly industrial sewing machines. A reciprocatory advance motion is imparted to a feed dog means by an eccentric means connected to a driven shaft in the machine and to a feed advance shaft which imparts an oscillating motion to the feed dog means. A feed dog lift means for imparting a lift motion to the feed dog includes an eccentric means also connected to the driven shaft. The mechanisms for imparting advance motion and lift motion to the feed dog are connected to a common fulcrum pin to provide a sturdy and stable mechanism capable of operating at high speeds with minimum noise and vibration. A second feed dog means is provided which has a common advance mechanism and a similar lift mechanism as the first mentioned feed dog means with each of the feed dog means being individually adjustable to provide a differential feed system in which two work feeding elements are adapted to be actuated so as to exert unequal feeding actions on the work, if desired.