Use the links on the nhc home page to answer these question 使用鏈接在nhc主頁回答這些問題。
National hurricane center , nhc 國家颶風中心
By using sterically hindered , electron - rich alkylphosphines and n - heterocyclic carbenes ( nhc ) , this process has encompassed a broad range of substrates including ketones , aldehydes , esters , amides , malonates , nitrocompounds , nitriles and sulfones 隨著大位阻、富電子烷基膦和氮雜環卡賓( nhc )為配體的催化體系的出現,該類反應的底物已從酮擴展到醛、酯、酰胺以及含酸性氫的化合物如丙二酸酯、硝基化合物、腈、砜等。