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This cyclization is reversible, but several other subsequent reactions can occur instead, depending on structural details and whether certain other reagents are present. In keeping with the WoodwardвЂ“Hoffmann rules, molecular orbital symmetry analysis of the photochemical reaction of the six-electron system explains the trans relative configuration at the newly bound centers by a conrotatory process. Although only cis structures can undergo the cyclization step themselves, trans structures can isomerize in situ and then cyclize. For stilbene and other chemicals containing a double-bond linker between the two aromatic rings, the excited structure can undergo reversible cis- trans isomerization. Regardless of the presence or absence of an oxidant, the first step of the reaction is photochemical excitation of a stilbene or similar structure, leading to formation of a dihydrophenanthrene or similar intermediate. amides ), and substrates containing a single heteroatom in place of the stilbene double bond also undergo the reaction. Aryl enynes, heteroatomic stilbene derivatives (e.g. Suitably substituted stilbenes may undergo irreversible, rearomatizing elimination or -shift processes in the absence of an oxidant. Typically, the dihydrophenanthrenes themselves are relatively unstable, and revert to cis-stilbenes in the absence of a hydrogen-trapping agent. In the presence of an oxidant, the dihydrophenanthrenes aromatize to give polycyclic aromatics. Under UV irradiation, stilbene and its derivatives undergo intramolecular cyclization to form dihydrophenanthrenes. This name reaction is named for Frank Mallory, who discovered it while a graduate student. IвЂ™d be more than happy to take another look at PhotoLinker when improvements are made to see if my recommendation against buying stands.In organic chemistry, the Mallory reaction is a photochemical-cyclizationвЂ“ elimination reaction of di aryl- ethylene structures to form phenanthrenes and other polycyclic form polycyclic aromatic hydrocarbons and heteroaromatics. PhotoLinker will have to add some real compelling features to justify the cost I canвЂ™t think of any features right now, so IвЂ™m not much help to the developer. I donвЂ™t see myself using additional EXIF tagging, so that feature isnвЂ™t a key to me. I canвЂ™t justify the $50 for PhotoLinker for a few user interface improvements.

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I donвЂ™t travel all that much, but anticipate taking vacations in the future with my family (have you ever travelled with a 2 year old? It isnвЂ™t the most pleasant experience.) For basic geotagging needs, the free GPSPhotoLinker will handle all my needs. I really like the concept of geotagging my photos. Normally I wouldnвЂ™t care, but when my end goal is to get geotagged files into iPhoto, automation would be most welcome.

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(The open source iGotU software is GPL licensed which would make it impossible without separate arrangements to integrate it.) The developer has indicated on his forums that this is due to licensing costs with the mainstream vendors. Map choices arenвЂ™t all that useful Google and the more mainstream maps arenвЂ™t options.There isnвЂ™t a lot to say as it does what it is supposed to do and does it simply. I put both products through some tests and the rest of this review will focus on the paid PhotoLinker product. Ability to add EXIF tags outside of the standard geotagging information such as keywords, description, people shown, and event.GPSPhotoLinker confuses the interface by having the first column be the area to geotag.

The basic PhotoLinker view puts the geotagging console hidden so that what you see are your pictures, a map, and tags associated with the picture.

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PhotoLinker starts adding bells and whistles that may make it worth $50 to prosumer or professional photographers. If all you need is geotagging, then I have to recommend the free GPSPhotoLinker as it worked well in my testing. Both programs link to the files and donвЂ™t copy them.) Both programs do their basic job well in that you load your tracks and pictures and basically click вЂњgeotagвЂќ. (Hint, create a folder on your hard drive and put all your track files there and keep them so that you can reference them later. In both programs, you load in your track files. GPSPhotoLinker and PhotoLinker share a main purpose and that is to geotag photos. I liked what I saw, so I asked the developer for a copy of PhotoLinker, GPSPhotoLinkerвЂ™s big brother, to review.

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In addition, the interface was very Mac like. I looked at many of them and GPSPhotoLinker worked quite well and was free to top it off. As part of reviewing the i-Got-U GT-120, I searched for a Mac solution to handle geotagging of photos.

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