Derivative Type: (E,E)-Form
CAS Registry Number: 136-72-1
Additional Names: Piperinic acid; piperinsäure (German)
Properties: Needles from alc. Colorless when freshly prepd, rapidly turns yellow on exposure to light. mp 216-217°. Sublimes as yellow needles with partial decompn. uv max (methanol): 340 nm (e 28800). Sol in 50 parts boiling alcohol, 275 parts abs alcohol at 25°. Practically insol in water, ether, benzene, carbon disulfide.
Melting point: mp 216-217°
Absorption maximum: uv max (methanol): 340 nm (e 28800)
Derivative Type: (E,Z)-Form
CAS Registry Number: 495-87-4
Additional Names: Isochavicinic acid
Properties: Yellow crystals from methanol/water, sublimes as needles. mp 134-136° (Lohaus, Gall); 143° (Grewe). uv max (methanol): 335 nm (e 14500). Sol in methanol, benzene.
Melting point: mp 134-136° (Lohaus, Gall); 143° (Grewe)
Absorption maximum: uv max (methanol): 335 nm (e 14500)
Derivative Type: (Z,E)-Form
CAS Registry Number: 495-88-5
Additional Names: Isopiperinic acid
Properties: Needles from benzene. mp 145° (Ott, Eichler); 153° (Grewe); 138° (DeCleyn, Verzele). uv max (methanol): 328 nm (e 22000). Sol in benzene.
Melting point: mp 145° (Ott, Eichler); 153° (Grewe); 138° (DeCleyn, Verzele)
Absorption maximum: uv max (methanol): 328 nm (e 22000)
Derivative Type: (Z,Z)-Form
CAS Registry Number: 495-89-6
Additional Names: Chavicinic acid
Properties: Amorphous yellow granules from benzene. Wide disparities in mp have been reported: 200-202° (Ott, Eichler); 130° (Grewe); 120° (De Cleyn, Verzele). uv max (methanol): 335 nm (e 17500). 0.55 g sol in 16 g boiling 95% alcohol, and in 65 g boiling benzene.
Melting point: mp have been reported: 200-202° (Ott, Eichler); 130° (Grewe); 120° (De Cleyn, Verzele)
Absorption maximum: uv max (methanol): 335 nm (e 17500)
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