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Gels are washed free of excess reactants and by-products with 0 . 2 M NaC1 (saline) by ( 1 ) suction filtration on porcelain Biichner funnels using W h a t m a n No. 1 or No. 5 paper circles, and ( 2 ) repeated batch washing: stirring with 5 - 2 5 volumes of saline, allowing settling by gravity, and siphoning off the supernatant. It is advantageous to limit the period of settling in order to remove fines. The two methods of washing are BOne may, for example, discard the slowest sedimenting one-third of the beads in the 50 to 100-mesh range.
0 mmole/g. 4 M ) . A great deal of heat is generated when the latter is mixed with water. Therefore, it should be added carefully t o water. Dilutions should be carried out in a hood. 1 M and titrating with standard 1 or 2 N HCI to a methyl red end point (pH 5). One mole of hydrazine is equivalent to 1 mole of HCI since the alterate nitrogen atom of a hydrazinium ion is protonated at a very much lower pH. 0395(T2 - T1). Values of h, and h2 correspond, respectively, to temperatures T1 and Tz. 48.
P. 79. Academic Press, New York, 1971. ,4 R. Ax6n, P. Vretblad, and J. Porath, Acta Chem. Scand. 25, 1129 (1971). 25 R. Ax6n and P. Vretblad, Acta Chem. Scand. 25, 2711 (1971). ~'R. Axfin, J. Porath, and S. Ernback, Nature (London) 214, 1302 (1967). ,7 j. Porath, R. Ax6n, and S. Ernback. Nature (London) 215, 1491 (1967). 2, R. Ax6n and S. Ernback, Eur. J. Biochem. 18, 351 (1971). :~J. Porath, Nature 218, 834 (1968). 22 COUPLING REACTIONS AND GENERAL METHODOLOGY  1,2-Diols are especially liable to react with cyanogen halides to form cyclic imino carbonates.