Abstract: Disclosed is process for the treatment of cyclopropanecarboxaldehdye (CPCA) which contains crotonaldehyde impurity with a base at elevated temperature to convert the crotonaldehyde to one or more higher boiling compounds followed by distillation to recover CPCA substantially free of crotonaldehyde. This selective reaction may be combined with a distillation to purify CPCA or in combination with the reaction of the CPCA in the treated mixture to produce a CPCA-derivative while avoiding or minimizing the formation of the analogous crotonaldehyde derivative.

Abstract: A bicycle includes a flywheel mounted coaxially and rotatably with respect to a pedal-carrying shaft. The flywheel is drivingly coupled to the rear tractive wheel via a pair of friction wheels mounted in gear train fashion to provide a ratio of at least 1,000 revolutions of the flywheel per revolution of the tractive wheel. One of the intermediate wheels serves as a slip clutch for selective engagement with the tractive wheel. This clutch wheel has its axle mounted in an elongated slot. A bendable arcuate control lever positions the axle along the slot.