摘要:
A pipelayer machine including a tractor with rubber mounted tracks and a boom supported by the tractor for lifting and lowering the pipe to be laid. The boom is pivoted on one side of the tractor, and the boom line winch is supported on the other side. The boom line crosses in front of the windshield of the tractor and there are specially designed boom line cable fairleads at each front corner of the cab to prevent damage to the windshield and to the driver within the cab.
摘要:
A process for preparing (+)-p-mentha-2,8-diene-1-ol comprising reacting (+)-limonene oxide with at least one amine in the presence of at least one Lewis acid to form amine adduct intermediates. The amine adduct is then oxidized to form an N-oxide that is pyrolized to form (+)-p-mentha-2,8-diene-1-ol.
摘要:
Synthetic pathways are disclosed for synthesizing derivatives or analogs of fentanyl. Specifically set out are pathways for synthesizing alfentanil, sufentanil and remifentanil. The disclosed methods require fewer steps and produce a greater yield of product than methods reported in the prior art.