When UV light reacts with pyrimidines, it forms rings of this size.
A NorrishÂ–Yang photoreaction forms a ring containing this many carbons. When UV light reacts with pyrimidines, it forms rings of this size. Ring D of taxol contains this many atoms. Counting the metal, the mechanism of a ZieglerÂ–Natta catalyst forms a ring of this many atoms. The cycloÂ·alkane of this size puckers between two "butter&amp;y" con gurations. Rings of this size are the smallest described by the WoodwardÂ– Hoffmann rules. TriÂ·phenylÂ·phosphine oxide is formed by the rearrangement of a cyclic intermediate of this size in the Wittig reaction. The simplest antiaromatic hydrocarbon is a ring with this number of atoms. Beta-lactam antibiotics have a reactive central ring of this many atoms. Steroids have this many fused rings. For 10 points, give this number of carbons in cyclobutane.
A NorrishÂ–Yang photoreaction forms a ring containing this many carbons.
four