d h d by
WALTER A. WOLF Eisenhower College Seneca Falls. New York 13148
An Inexpensive Model tor Illustrating Stereochemistry of SN1 and SN2Reactions (Old Music Stands Never Die-They Just Invert Away) James M. Garrett E. L. Griffin Stephen F. Austin State University Nacogdoches, Texas 75962 Often instructors with limited shop facilities andlor limited budgets are forced to forego many types of demonstrations performed by their colleagues a t larger institutions. While one of us (ELG)was searching for an inexpensive and easily constructed model to illustrate SN1 and S N reactions, ~ he happened across a discarded music stand in his attic which since has been used to serve that purpose well. The base of the stand was removed along with half of the shaft which orieinallv connected the base to the music holder and hrightly c"1oredsolid ruhher balls were attached to the four extendinr auuendaees. This rave n model of a tetrahedral carbon with fk;;roupsattachei The three legs of the stand were ioined hv ruhber bands and the remainder of the shaft was inserted into a fifth brightly colored solid rubber ball. This became our nucleo~hilewith its free electrons proiecting into space. Our model now is similar in appearance and utility to the one constructed by Newman [J. CHEM EDUC., 52,462 (1975)l.
516 I Journal of Chemical Education
