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CHsCH=CHz+ HCI HCCk +OH RzNCH=CHz + HCI (CH3CHz)zO + BF3 CHz=COCHs + Brz NHs + H z 0 CH3CHO + OHCHsOCHzt + H z 0 CH3CHO + CN CH3COCH3 + Ht CHFCHZ + BrzThese examples were chosen to show that curved arrows always emanate from an e-pair; even though in the case of an n-pair, it may not be written in, the tail of an arrow follows the head of a previous arrow, and while the curved m w s mav be formallv correct. thev are drawn erronmusly lithe; do nor refl4r the chemical propcrtm of the reactants At the beginning of the tutorial the student has the option of reviewing the explanation of the use of curved arrows or of branching to the exercises. At the end of the description of curved arrows, the student can review the material again or continue to the exercises. At the end of each exercise the option to exit the program exists, while at the end of the tutorial one can branch to the beginning of the tutorial or to the start of the exercises. Since the tutorial is protected from wrong key response, it is user friend15 The tutorial entitled CURVARR and written in GWBASIC used as programmer tools from SERAPHIM a machine language routine, BSGRAPH, written by Felino Pascual; a BASIC program, CHR$GEN, authored by Martin Rose; and a well-written documentation, CHR$-GEN.DOC, by James R. Hutchison. The program, which requires 64K memory, a 640 x 200 graphics adapter, MS DOS 2.0 or greater, and GWBASIC 2.02 or greater, runs on IBM compatible clones including the ATT 6300. The program also executes with an EGA or VGA system. A disc copy of the tutorial and documentation is available through SERAPHIM.

PPh2)2Rh(COD) should be half the number in [Rh(/t-PPh2)(COD)]2, if both COD ligands are lost from the latter. The rate of hydrogenation of 1-octene with [(DPPE)Rh(/u-PPh2)2Rh(COD)] is actually greater than the rate for [Rhgrants that aided the purchase of the 300-and 200-MHz NMR instruments, respectively. We also thank Professor G. G. Christoph for help with the X-ray structure determination and the John Simon Guggenheim Foundation for a fellowship to D.W.M. for 1981-1982.