[ethanham]

I found that prolonged heating of glycine in the presence of quartz sand will produced glycyl-glycine, alaine, methylamine, aspartic acid, oxalic, succinic and fumaric. What about prolonged heating with only glycine at 170oC? What compound will be different?

TIA

[AWK]

Heating usally is not a good method for high yield synthesis. But heating glycin without catalyst vill give you a quite good yield of diketopiperazine first

http://en.wikipedia.org/wiki/Diketopiperazine

[Arkcon]

I found that prolonged heating of glycine in the presence of quartz sand will produced glycyl-glycine, alaine, methylamine, aspartic acid, oxalic, succinic and fumaric. What about prolonged heating with only glycine at 170oC? What compound will be different?

TIA

You got all that, from heating with sand.  Do your heating at 170 C, then just analyze again, and see what you get.