谷歌发布多模态嵌入模型EmbeddingGemma 2

yun2026

谷歌发布多模态嵌入模型EmbeddingGemma 2

2026年9月，中国科学院上海有机化学研究所公布一项精准合成研究。团队围绕官能团化的1,3-二烯设计钯与酸协同参与的催化体系，使相同起始原料能够按不同路径生成空间结构不同的产物。这类原料在化学合成和工业生产中十分常见，但多个反应位置与空间构型同时存在，往往增加了定向制备的难度。

研究人员通过设计手性配体，并调节酸、碱等反应条件，实现了对反应位置、双键几何形态以及多种立体选择性的协同控制。所用条件较温和，催化剂用量可降低至千分之一，体系对空气和水也不敏感。产物保留的酯基为后续改造留下空间。机理实验和计算进一步解释了不同反应步骤如何影响最终结构，为调整催化条件提供依据。该工作为从同一原料出发构建不同精细化学品提供新工具，其价值主要在于提高合成选择性和拓展结构设计能力，具体生产应用仍需针对目标产物开展工艺评估。

https://lightroom.adobe.com/shares/a695e8b28f2fa0459d6386898a0dc15d
https://lightroom.adobe.com/shares/6603c1349a626141b5550b04b249c162
https://lightroom.adobe.com/shares/2cb7c1279cee9341a32ca3a31b855a7c
https://lightroom.adobe.com/shares/ea6d409ab0508d4ab0920c2cd2697173
https://lightroom.adobe.com/shares/519f44cf86765b418ee620c1a08e7244
https://lightroom.adobe.com/shares/191b134b6635ca4abced9a2d33f541e0
https://lightroom.adobe.com/shares/f3d061e6c6af404f8bc77ff2caf0a14a
https://lightroom.adobe.com/shares/1f21ab40e18ef14cbe9955b086e22b79
https://lightroom.adobe.com/shares/898df740d9bf754a8fd28272efa56d83
https://lightroom.adobe.com/shares/179b74b9527cde42bc0c69e2332e03a7
https://lightroom.adobe.com/shares/ba08a5ffc820b74e85ee32c2a78546b4
https://lightroom.adobe.com/shares/8d0c645315289644b69a1fcfdaa62d54
https://lightroom.adobe.com/shares/03996cd5b185434da4c57cbcf20420ac
https://lightroom.adobe.com/shares/3a5b6bcd99eee840a2d7266d87362128
https://lightroom.adobe.com/shares/2a0b714372c66d4dab54805ee96c1eb8
https://lightroom.adobe.com/shares/0ab0a1c8eac43c4092c3e75977c2233d
https://lightroom.adobe.com/shares/8664da0cccd02646926532055af14eae
https://lightroom.adobe.com/shares/1d476c2c35421c4c95b9b9700c95e38a
https://lightroom.adobe.com/shares/a9d2da610dd4c944aa2da44423c74a27
https://lightroom.adobe.com/shares/f606f4ef17343448bdd6ed39c97a9bba
https://lightroom.adobe.com/shares/01a27434bc873e448d0c69c743866a95
https://lightroom.adobe.com/shares/51412df2f05ea9449028819cb6b5e4b9
https://lightroom.adobe.com/shares/6e940a4477e8ed40b1a77093c95b24e1
https://lightroom.adobe.com/shares/44c7ed94f84eb54285e5c4ac37c5b375
https://lightroom.adobe.com/shares/32000ae95c4e4f48bbc1cbef8416ea2a
https://lightroom.adobe.com/shares/aef972a50b52cd4794d9a7d009e8860b
https://lightroom.adobe.com/shares/b9dbd73bc0eb314e80131ff1dbe6a444
https://lightroom.adobe.com/shares/0fcc05305899714097fd3e10906b66e0
https://lightroom.adobe.com/shares/a818571c94129046ba65c6a07ee4a880
https://lightroom.adobe.com/shares/376e6952477f9344b54e63f15d0aa7c1
https://lightroom.adobe.com/shares/bd78c37d5e05844291ebdc9ef7260258
https://lightroom.adobe.com/shares/f21842ce43328944810ce3ff4b909162
https://lightroom.adobe.com/shares/02b1516983ca3e4cb92010b6a3c46c23
https://lightroom.adobe.com/shares/31f7e23e9d1494409f0ecf64efc73499
https://lightroom.adobe.com/shares/e80f476dde081e44b9baa1aa24e52d37
https://lightroom.adobe.com/shares/9f2cd1a03e21354cb69c14e78fd9dc7b
https://lightroom.adobe.com/shares/bb01a9e69855364688290acc38029dd9
https://lightroom.adobe.com/shares/370db73530a4eb468aa9454770d896eb
https://lightroom.adobe.com/shares/9622cc300524a54b81242c6e36123c7b
https://lightroom.adobe.com/shares/35d893e2c639e646aed26815cfec093f
https://lightroom.adobe.com/shares/d00c6e8dc62b3b45a0c46858af99cf92
https://lightroom.adobe.com/shares/94d6da25ee738e49b445bf926e1094c7
https://lightroom.adobe.com/shares/ca77ca6e18eedf4199a3bd357e84fd14
https://lightroom.adobe.com/shares/3dbb976dea79ff47b782d2d04fa37ea5
https://lightroom.adobe.com/shares/ad31eba80735974bb4ca75ed78151737
https://lightroom.adobe.com/shares/03fc66cfa8982344bedbf7d09d0474b9
https://lightroom.adobe.com/shares/1d6e797dcb7c694bb4d0dc0c10e60ba3
https://lightroom.adobe.com/shares/75b5005b42b1cc46b3e5f0c1439ee85d
https://lightroom.adobe.com/shares/9b195aee26d1634b8037f20fd9cd4518
https://lightroom.adobe.com/shares/cd06b67fd0452b4bb3cf1389490469df