Representative procedure for 1,6-addition with 1dc as a catalyst. A test tube was charged with a magnetic stirrer bar and molecular sieves 4 Å (MS4A, 100 mg) under argon atmosphere. MS4A was then dried with a heat gun under reduced pressure for 5 min and the test tube was refilled...
chlorine = ___ ___ = N Chemical Symbols: The chemical symbol of an element represents the element, making it easier to refer to the element without using its name every time. The chemical symbols of elements are determined using a method that depends on the nam...
(5 mol%) in dehydrated toluene under an argon atmosphere at 0 °C afforded a mixture of addition products, including desired 1,6-adduct4aa, with variable selectivities (a representative result is shown inTable 1, entry 1). On the other hand, attempting the reaction in the presence of...