Non-directed highly para-selective C H functionalization of TIPS-protected phenols promoted by a carboxylic acid ligand

Palladium‐Catalyzed Pyridine Ligand‐Promoted Non‐Directed C−H Olefination of Phenol Derivatives

“…[21] Recently, our research group reported nondirected para-selective alkenylation of phenol derivatives by using the large steric hindrance strategy. [22] However, nondirected ortho-selective reactions of phenols remain rare; herein, we report a palladium-catalyzed ligand promoted orthoselective olefination of silyl-protected phenols. Various phenols were well tolerated, yielding olefinated products in moderate to good yields.…”

Recent Advances in Fiber-Optic Sensors for the Detection of Inorganic Acidic Gases

“…where I in is the intensity of incident light, I out is the intensity of output light, L is the length of the fiber sensing region, ξ(n) is the attenuation coefficient of evanescent waves by target gas molecules or sensitive materials, and n is the RI of the target gas molecules or sensitive materials. Particularly, for the sensing region with the straight structure, ξ(n) can be described as [26,44,45] 2 ( ) cos cot 2 ( )…”

“…Currently, in-situ online sensors for the detection of acidic gases include resistive electrical sensors [19], electrochemical sensors [20,21], surface acoustic wave sensors [22,23], and fiber-optic gas sensors [24]. Among these, fiber-optic sensors are the sensing technology that uses optical fibers as sensitive components or signal transmission channels, exhibit the low cost, fast response speed, and wide measurement range, and have been rapidly developed and applied in different fields [25][26][27][28]. Similarly, fiber-optic sensors have high corrosion resistance, anti-electromagnetic interference, suitability for long-distance online distributed/ quasi-distributed measurements, and applicability in small spaces [29].…”