摘要:
A compound with immunosuppressive properties having formula (I), in which R.sup.1 represents a heterocyclic ring system, a combined heterocyclic ring system and homocyclic ring system, or an ethoxycarbonylmethyl group. R.sup.2 and R.sup.3 represent hydrogen or lower alkyl groups.
摘要:
Total synthesis of steroids with substitution in the 2,3, 6, 11 or 17 positions comprising the step of cyclization of a compound having the formula ##STR1## or analogues thereof, where X represents .dbd.O, ##STR2## or .beta.-substituted ##STR3## Y represents .dbd.O, .beta.-oriented ##STR4## or .beta.-orientated OH, R' and R.sup.2 may be the same or different and R' represents alkyl or aryl and R.sup.2 represents alkyl and Z represents ether or hindered ester to form the novel compounds ##STR5##
摘要翻译:包括在2,3,6,11或17位置取代的类固醇的总合成,包括使具有式(1)的化合物或其类似物环化的步骤,其中X表示= O 或者β取代的Y,Y表示= O,β取向的图像或β取向的OH,R'和R 2可以相同或不同,R'表示烷基或芳基,R 2表示烷基或 Z表示醚或受阻酯以形成新化合物。(2)图像(2A)
摘要:
A process is disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble expanding technique which permits high production rates to be achieved with good film bubble stability. Advantageously, most of the films produced by the process have a relatively high degree of film clarity.
摘要:
Method and apparatus are disclosed for the low energy melting, extrusion and pumping of material comprising feeding, metering, melting and mixing of such materials in an extruder having a melter screw and subsequently passing the resultant extrudate, through breaker plate and adapter means, to and through a rotary gear pump and, in turn, to a die member.
摘要:
A process and apparatus are disclosed for forming blown film of a low strain hardening polymer, such as a low pressure polymerized-low density ethylene copolymer, including an improved film bubble cooling technique which permits high production rates to be achieved with good film bubble stability. The disclosed process comprises cooling a molten film bubble by contacting the outside of the film bubble with separate annular streams of cooling fluid fed through at least two stacked annular cooling rings disposed around the film bubble, wherein all or substantially all of the cooling fluid exits the system through a common plane formed by the last cooling ring.The disclosed apparatus comprises means for forming a molten film bubble and means for cooling same including at least two separate annular cooling rings disposed around the bubble, each provided with means for feeding an annular cooling fluid stream against the bubble and further including means whereby all or substantially all of said cooling fluid exits the system through a common plane formed by the last cooling ring.