In terms of form, propadiene H2C=C=CH2 is the simplest spiro ring, and an appropriately substituted propadiene such as 1,3-propadienediic acid is optically active and can be split into two optically active isomers. body.
ກ່ຽວກັບຮູບແບບ, propadiene H2C = C = CH2 ແມ່ນວົງ spiro ທີ່ງ່າຍດາຍທີ່ສຸດ, ແລະ propadiene ແທນທີ່ເຫມາະສົມເຊັ່ນ: 1,3-propadienediic ອາຊິດແມ່ນກິດຈະກໍາ optically ແລະສາມາດແບ່ງອອກເປັນສອງ isomers ທີ່ມີການເຄື່ອນໄຫວ optically.