Sulfur. .. Phosphorus

The metal reacts directly with elemental carbon, nitrogen, boron, selenium, silicon, phosphorus, sulfur, and with halogens. 

Olefin synthesis starts usually from carbonyl compounds and carbanions with relatively electropositive, redox-active substituents mostly containing phosphorus, sulfur, or silicon. The carbanions add to the carbonyl group and the oxy anion attacks the oxidizable atom Y in-tramolecularly. The oxide Y—O" is then eliminated and a new C—C bond is formed. Such reactions take place because the formation of a Y—0 bond is thermodynamically favored and because Y is able to expand its coordination sphere and to raise its oxidation number. 

Mercury(II) oxide Chlorine, hydrazine hydrate, hydrogen peroxide, hypophosphorous acid, magnesium, phosphorus, sulfur, butadiene, hydrocarbons, methanethiol... 

E. Pohjala and co-workers. Phosphorus Sulfur Silicon, 76, 159 (1993) The Merck Index, 11th ed., Merck and Co., Rahway, N.J., 1989. 

Riesel, L Haenel, J Phosphorus, Sulfur, Silicon Relat. El 1990,49/50,... 

T. Chivers, X. Gao, N. Sandblom and G. Schatte, Recent Developments in Tellurium-Nitrogen Chemisti y, Phosphorus, Sulfur and Silicon, 136-138, 11 (1998). 

The curious phase relations between phosphorus, sulfur and their binai compounds are worth noting. Because both P4 and Sg are stable molecules the phase diagram, if studied below 100°, shows only solid solutions with a simple eutectic at 10° (75 atom % P). By contrast, when the mixtures are heated above 200° the elements react and an entirely different phase diagram is obtained however, as only the most stable compounds P4S3, P4S7 and P4S10... 

---