Boat-chair-boat Conformation
Reacting from the most stable boat-chair-boat conformation, asymmetric epoxidation of the cis-internal olefin can be achieved without using a reagent-controlled epoxidation method or a directed epoxidation with an allylic alcohol.. Introduction the major conformation of cyclodecane (1) at low-temper- atures was found in a dynamic nmr study1 to be the boat- chair-boat (bcb, 1a), which corresponds to the rectangular diamond-lattice [2323] conformation according to dale’s no- menclature.2 the bcb (figure 1) is the solid-state conformation of 13 and the ring conformation of. Atures was found in a dynamic nmr study1 to be the boat-chair-boat (bcb, 1a), which corresponds to the rectangular diamond-lattice [2323] conformation according to dale’s no-menclature.2 the bcb (figure 1) is the solid-state conformation of13 and the ring conformation of most of its solid derivatives.4 this.
A simple way to draw the chair and boat conformations of cyclohexane undergraduate students in chemistry and biochemistry have difficulty in rcprcsenting uyeluhexane according to the mamconfarmatrnns knownas thechairformrfig. l jand the boat form(f~g. 2,.. Crystallography, however, shows that 9-keto-10s3 adopts a [2323] boat–chair–boat conformation with one exodentate and two endodentate sulfur atoms; molecular mechanics calculations indicate that the crystal structure lies 1.6 kcal mol −1 higher in energy than the [2233] conformer.. [graphics] interconversion of carbon sites in boat-chair-boat (bcb) cyclodecane occurs by way of the twist-boat-chair (tbc) conformation, which predicts that c-1 exchanges with c-4, etc..
